SROS Command Line Interface Reference Guide
Global Configuration Mode Command Set
5991-2114
© Copyright 2007 Hewlett-Packard Development Company, L.P.
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ip mcast-stub helper-address
<ip address>
Use the
ip mcast-stub helper-address
command to specify an IP address toward which IGMP host reports
and leave messages are forwarded. This command is used in IP multicast stub applications in conjunction
with the
ip mcast-stub downstream
and
ip mcast-stub upstream
commands. Use the
no
form of this
command to return to default.
Syntax Description
<ip address>
IGMP host reports and leave messages are forwarded toward this address.
Default Values
By default, no helper-address is configured.
Functional Notes
Helper-address is configured globally and applies to all multicast-stub downstream interfaces. The address
specified may be the next upstream hop or any upstream address on the distribution tree for the multicast
source, up to and including the multicast source. The router selects, from the list of multicast-stub upstream
interfaces, the interface on the shortest path to the specified address. The router then proxies, on the se-
lected upstream interface (using an IGMP host function), any host joins/leaves received on the downstream
interface(s). The router retransmits these reports with addresses set as if the report originated from the se-
lected upstream interface.
For example, if the router receives multiple joins for a group, it will not send any extra joins out the
upstream interface. Also, if it receives a leave, it will not send a leave until it is certain that there are no
more subscribers on any downstream interface.
Usage Examples
The following example specifies 172.45.6.99 as the helper-address:
ProCurve(config)#
ip mcast-stub helper-address 172.45.6.99
Содержание ProCurve Secure 7102dl
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